From 175b79f0632544d62aae72e5496c14e3e3ff2ae7 Mon Sep 17 00:00:00 2001 From: Christof Schmitt Date: Fri, 10 Sep 2010 20:50:40 +0200 Subject: [PATCH] zfcp: Report scatter gather limit for DIX protection information When sending DIX integrity segments with an I/O request, the restriction for the maximum number of segments is still the same for the zfcp hardware. Report the new sg_prot_tablesize for the SCSI host, so that the number of integrity segments plus the number of data segments is not larger than the hardware limit. This results in using half of the hardware segments for integrity data and the other half for regular data. Reviewed-by: Swen Schillig Signed-off-by: Christof Schmitt Signed-off-by: Jens Axboe --- drivers/s390/scsi/zfcp_scsi.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c index cb000c9833bb..208256e39def 100644 --- a/drivers/s390/scsi/zfcp_scsi.c +++ b/drivers/s390/scsi/zfcp_scsi.c @@ -681,6 +681,7 @@ void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { mask |= SHOST_DIX_TYPE1_PROTECTION; scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); + shost->sg_prot_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2; shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2; shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2; } -- 2.20.1